Buy a cap that has the same length.
Capping off a chimney flue.
Measure the length and width of the flue on your chimney.
Capping unused chimneys flue ventilators uk.
However a standard chimney cowl can provide a good alternative to capping a chimney or if you think you may use the flue later to connect an appliance.
Apply a bead of butyl rubber caulk around three sides of the chimney at.
Chimney cowls for capping chimney cowls are normally used to adequately ventilate chimney flues connected with an appliance like gas fires open flame gas fires wood burners coal fires etc.
The flue ventilator stops rain entry to the chimney but still allows a small amount of air passage for ventilation.
Find the flue on your chimney which is the clay or metal.
Get onto your roof with a ladder.
Capping the flue is one of the best ways to close up the top of the chimney as it will still allow air to get in and out preventing condensation from building up.
Flue ventilators can be found on our chimney potpage.
You should cap any unused chimneys with a flue ventilator.
Put on heavy work gloves and use tin snips to cut a piece of sheet metal to the same measurements as the chimney opening.